change to use Time.zone for rubocop-rails Rails/TimeZone (#932)

.rubocop_todo.yml

@@ -136,16 +136,6 @@ Rails/SquishedSQLHeredocs:
     - app/controllers/measurements_controller.rb
     - db/migrate/20160208190731_add_subtype_to_measurement_imports.rb
     - db/migrate/20160607005457_alter_measurement_imports_subtype_set_not_null.rb
-Rails/TimeZone:
-  Exclude:
-    - db/migrate/20130606042505_add_devise_confirmable_to_user.rb
-    - lib/tasks/boostrap.rake
-    - spec/acceptance/guest_signs_up_spec.rb
-    - spec/fabricators/user_fabricator.rb
-Rails/UniqueValidationWithoutIndex:
-  Exclude:
-    - app/models/device.rb
-    - app/models/device_story.rb
 
 RSpec/BeforeAfterAll:
   Exclude:

db/migrate/20130606042505_add_devise_confirmable_to_user.rb

@@ -7,7 +7,7 @@ def up
 
     add_index :users, :confirmation_token
 
-    User.update_all confirmed_at: Time.now
+    User.update_all confirmed_at: Time.zone.now
   end
 
   def down

lib/tasks/boostrap.rake

@@ -19,15 +19,15 @@ namespace :db do
       password_confirmation: '111111'
     )
     u.moderator = true
-    u.confirmed_at = Time.now
+    u.confirmed_at = Time.zone.now
     u.save
     puts "Created user #{u.email} with password #{u.password}"
     attrs = {
       name: 'Fake User',
       password: '111111',
       password_confirmation: '111111',
       moderator: false,
-      confirmed_at: Time.now
+      confirmed_at: Time.zone.now
     }
     %w([email protected] [email protected]).each do |email|
       u = User.create!(attrs.merge(email: email))

spec/acceptance/guest_signs_up_spec.rb

@@ -7,7 +7,7 @@
     scenario 'signing up' do
       sign_up
       new_user = User.last
-      new_user.confirmed_at = Time.now
+      new_user.confirmed_at = Time.zone.now
       new_user.save
       new_user.password = 'mynewpassword'
       sign_in(new_user)

spec/fabricators/user_fabricator.rb

@@ -5,14 +5,14 @@
   email { "paul#{Fabricate.sequence(:email)}@rslw.com" }
   password 'monkeys'
   default_locale 'en-US'
-  confirmed_at Time.now
+  confirmed_at Time.zone.now
 end
 
 Fabricator(:admin_user, from: :user) do
   name 'Admin'
   email '[email protected]'
   password '111111'
-  confirmed_at Time.current
+  confirmed_at Time.zone.now
   default_locale 'en-US'
   moderator true
 end